50x^20+50x^19+50x^18+50x^17+50x^16 =553.187
    50x^11+50x^12+50x^13+50x^14+50x^15 =280.905
    50x^11+50x^12+50x^13+50x^14+50x^15=401.454
    50x^10+50x^9+50x^8+50x^7+50x^6=313.515
    50x^10+50x^9+50x^8 =313.55
    7600/(x+102*0.22)+10000/x=150
    7600/(x+107*0.22)+10000/(x+107*0.1)+10000/x=150
    (3x+1)/2＝2-(2x-1)/6
    (3x+1/2＝2-(2x-1)/6
    2/3x-2=4/3(5/3x-2)^2-8/3(5/3x-2)-4
    7600/(x+112*0.32)+10000/(x+112*0.2)+10000/x=150
    7600/(x+107*0.22)+10000/(x+107*0.1)+10000/x=150
    x=x-2+4
    ex*lnx+ex/x=0
    ex*lnx
    x^2(x-3)=20240114
    xlogx
    x=(100+x)(13%一9%)
    x-(x*13%-0.09)*12%=1
    x-(x*13%-0.09)*12%=1

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